Neither Foundation nor RTSM have a SPI device, but here are the necessary driver changes as an example of how to use acpi_amba_dsm_lookup() to get non-standard parameters from ACPI.
This was tested by wiring up a SPI device into an RTSM Fast Model.
Signed-off-by: Brandon Anderson brandon.anderson@amd.com --- drivers/spi/spi-pl022.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+)
diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c index 9c511a9..1d0a8ec 100644 --- a/drivers/spi/spi-pl022.c +++ b/drivers/spi/spi-pl022.c @@ -43,6 +43,7 @@ #include <linux/gpio.h> #include <linux/of_gpio.h> #include <linux/pinctrl/consumer.h> +#include <linux/amba/acpi.h>
/* * This macro is used to define some register default values. @@ -2069,6 +2070,55 @@ pl022_platform_data_dt_get(struct device *dev) return pd; }
+#ifdef CONFIG_ACPI +static struct pl022_ssp_controller * +acpi_pl022_get_platform_data(struct device *dev) +{ + struct pl022_ssp_controller *pd, *ret; + struct acpi_amba_dsm_entry entry; + + pd = devm_kzalloc(dev, sizeof(struct pl022_ssp_controller), GFP_KERNEL); + if (!pd) { + dev_err(dev, "cannot allocate platform data memory\n"); + return NULL; + } + ret = pd; + + pd->bus_id = -1; + pd->enable_dma = 1; + if (acpi_amba_dsm_lookup(ACPI_HANDLE(dev), "num-cs", 0, &entry) == 0) { + if (kstrtou8(entry.value, 0, &pd->num_chipselect) != 0) { + dev_err(dev, "invalid 'num-cs' in ACPI definition\n"); + ret = NULL; + } + kfree(entry.key); + kfree(entry.value); + } + if (acpi_amba_dsm_lookup(ACPI_HANDLE(dev), + "autosuspend-delay", 0, &entry) == 0) { + if (kstrtoint(entry.value, 0, &pd->autosuspend_delay) != 0) { + dev_err(dev, "invalid 'autosuspend-delay' in ACPI definition\n"); + ret = NULL; + } + kfree(entry.key); + kfree(entry.value); + } + if (acpi_amba_dsm_lookup(ACPI_HANDLE(dev), "rt", 0, &entry) == 0) { + pd->rt = (entry.value && strcmp(entry.value, "1") == 0); + kfree(entry.key); + kfree(entry.value); + } + + return ret; +} +#else +static struct pl022_ssp_controller * +acpi_pl022_get_platform_data(struct device *dev) +{ + return NULL; +} +#endif + static int pl022_probe(struct amba_device *adev, const struct amba_id *id) { struct device *dev = &adev->dev; @@ -2081,6 +2131,9 @@ static int pl022_probe(struct amba_device *adev, const struct amba_id *id)
dev_info(&adev->dev, "ARM PL022 driver, device ID: 0x%08x\n", adev->periphid); + if (!platform_info && ACPI_HANDLE(dev)) + platform_info = acpi_pl022_get_platform_data(dev); + else if (!platform_info && IS_ENABLED(CONFIG_OF)) platform_info = pl022_platform_data_dt_get(dev);